// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_H_
#define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_H_

#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"

namespace content {

class SpeechRecognitionEventListener;

// Handles speech recognition for a session (identified by |session_id|).
class CONTENT_EXPORT SpeechRecognizer
    : public base::RefCountedThreadSafe<SpeechRecognizer> {
public:
    SpeechRecognizer(SpeechRecognitionEventListener* listener, int session_id)
        : listener_(listener)
        , session_id_(session_id)
    {
        DCHECK(listener_);
    }

    virtual void StartRecognition(const std::string& device_id) = 0;
    virtual void AbortRecognition() = 0;
    virtual void StopAudioCapture() = 0;
    virtual bool IsActive() const = 0;
    virtual bool IsCapturingAudio() const = 0;

protected:
    friend class base::RefCountedThreadSafe<SpeechRecognizer>;

    virtual ~SpeechRecognizer() { }
    SpeechRecognitionEventListener* listener() const { return listener_; }
    int session_id() const { return session_id_; }

private:
    SpeechRecognitionEventListener* listener_;
    int session_id_;

    DISALLOW_COPY_AND_ASSIGN(SpeechRecognizer);
};

} // namespace content

#endif // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_H_
